Effects

Effects Chain Editor

Menu->Model FX gets you to the Effects Chain Editor where you can effect parameter values, using a familiar stomp-box UI. You can add, delete and reorder effects in the chain. There are three special items in the chain that are not audio effects, Perform, always first in the chain, which are the Performance Settings, Guitar, always second in the chain, which is the guitar model, and the Amplifier, always last in the chain, which is the output unit. Everything else is an audio effect.

Some effects are stereo, and some are mono, and some have special ordering constraints, which are described below.

Guitar distortion effect simulating the analog circuit of a
classic distortion stomp-box using a filtered dual-diode and separate
tone stage. Because this appears to be the most popular of the three
distortion units in GeoShred, and relatively expensive
computationally, it offers oversampling in the Expert menu.

The Multi-Tap Echo unit is four echo units in one. It is like
four Trail-Blazer Echo units, except that there is no Looping,
Scrubbing, or Warping, and there is individual Stereo Panning
on each of the four echo channels.

The phasing effect impresses sweeping notches
on the sound spectrum, like the
flanger. Each notch is
independently created and controlled using an
Allpass Filter section. As a result, for
a given computational load, there are fewer but more generally
controllable notches in the phaser compared to the flanger.

The Chorus
effect makes copies of its input sound and remixes them
to the stereo field using differently modulated delays, thus simulating
a chorus of nearly identical sound sources.

The Chorus output is always stereo,
while its input may be either mono or stereo. To minimize CPU usage,
place the Chorus at the point in your Effects Chain where the Effects
are mono to the left and stereo to the right.

The flanger effect impresses uniformly spaced
sweeping notches on the sound spectrum. It accomplishes this using a
variable comb filter, which works by mixing the
input sound with a variably delayed-and-scaled copy of the input.
Unlike the phaser, the flanger
notches are uniformly spaced on a linear frequency scale, and
there can be many more of them at low cost.

A reverberator creates a sense of space. Classic guitar amps use a "spring reverb", which is
one or more metal springs through which the sound propagates and disperses. GeoShred uses
a more modern design from the field of Computer Music based on
delay
lines
and Schroeder
allpass filters

The Wiz Verb is always stereo. It
is normally placed last in the Effects Chain.